Question

struct node *llink; what this instruction will do

Answer 1

This will create a variable named llink which will store address of node type variable...
typeName *name --> this says that 'name' will store address of any variable of type 'typeName'...
now,
typeName var; //you create a variable 'var' of type 'typeName'
name = &var; // & is saying give me the address at which var is stored in memory

so in the case
struct node *llink;
struct node newNode; //a variable of type struct node
llink = &newNode; // storing the address of newNode in llink